<template>
  <div>
      <!-- 面包屑区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>数据统计</el-breadcrumb-item>
        <el-breadcrumb-item>数据报表</el-breadcrumb-item>
      </el-breadcrumb>

      <!-- 卡片视图区域 -->
      <el-card>
        <div id="main" style="width:750px;height:400px;"></div>
      </el-card>
  </div>
</template>

<script>
// 导入echarts
import echarts from 'echarts'
// 导入lodash
import _ from 'lodash'
export default {
    data() {
        return {
            // 需要跟请求的折线图数据合并的options
            options: {
                title: {
                    text: '用户来源'
                },
                tooltip: {
                    trigger: 'axis',
                    axisPointer: {
                            type: 'cross',
                            label: {
                                backgroundColor: '#41b584'
                            }
                        }
                },
                grid: {
                    left: '3%',
                    right: '4%',
                    bottom: '3%',
                    containLabel: true
                },
                xAxis: [
                    {
                        boundaryGap: false
                    }
                ],
                yAxis: [
                    {
                        type: 'value'
                    }
                ]
            }
        }
    },
    async mounted() {
        // 在页面dom元素加载完毕之后执行的钩子函数mounted
        // 基于准备好的dom，初始化echarts实例
        var myChart = echarts.init(document.getElementById('main'))
        const { data: res } = await this.$http.get('reports/type/1')
        if (res.meta.status !== 200) { this.$message.error('获取数据失败!') }
        // 合并res.data和this.options
        const result = _.merge(res.data, this.options)
        // 使用获取的数据展示图表
        myChart.setOption(result)
    }
}
</script>

<style lang="less" scoped>
.el-breadcrumb{
    font-size: 14px;
}
</style>
